The knife-wielding madman who stabbed a 10- month-old Washington Heights girl as she sat in her stroller was indicted for attempted murder and assault yesterday by a Manhattan grand jury, law-enforcement sources said.

Bernard Derr, 48, was charged in last Wednesday’s unprovoked broad-daylight attack on little Isabelle Avins. He faces up to 25 years in jail on the charges.

Derr, a diagnosed schizophrenic, lunged at the bubbly infant as her nanny was pushing her down the street, according to police.

He plunged his knife into her belly, nearly disemboweling her, police said.

Isabelle, who was not expected to survive the heinous attack, has undergone “multiple surgeries” and is now “progressing as well as can be expected,” a law-enforcement source said.

The baby’s nanny, Parbatti Ramroop, 44, remains tormented by the attack. Hours after the stabbing, she mumbled, “Why didn’t he do it to me? He should have done it to me,” a witness said.

Derr’s lawyer, Deborah Wright, said last week that she has been unable to communicate with him because “he is not able to answer questions [and] is talking about other random things.”

A former mental patient who shared a ward with Derr described him as “very low-functioning.”

A judge has ruled him competent to understand the charges against him.